<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>浮动元素搭配标准流父盒子2</title>
    <style>
        * {
            margin: 0;
            padding: 0;
        }
        li{
            list-style: none;
        }
.box{
    height: 285px;
    width: 1226px;
background-color: pink;
margin:0 auto;
}
.box li{
    width: 296px;
    height: 285px;
    background-color: blue;
    float: left;
    margin-right:14px;
}
.box .last{
    margin: 0;
}
    </style>
</head>

<body>
    <ul class="box">
        <li>1</li>
        <li>2</li>
        <li>3</li>
        <li class="last">4</li>
    </ul>
</body>

</html>